Pressure-regulating and retaining handle for portable drills



y 1948- J. T. RICHARDS 4 PRESSURE REGfJLA TING AND RETAINING HANDLE FOR PORTABLE DRILLS Filed Oct. 31, 1945 2 Sheets-Sheet 1 Inventor I By M W J. T. RICHARDS 2,441,444

PRESSURE REGULATING AND RETAINING HANDLE FOR PORTABLE DRILL S May 11, 1948.

Filed Oct. 31, 1945 2 Sheets-Sheet 2 I n ven tor Ric 71am; M

Patented May 11, 1948 PRESSURE-REGULATING ANDRETAINING HANDLE Pompom-Anne mums J, Taliesin aiehasast Wilkes-Barre, Pal Catherine. Richards, administratrix at saidJ. TaliesinRicm ands, deceased Application October 31, 19455, ,Seri'ah-Nm. 625,725

This invention relates to an improved-pressure handle which is applicable tovarioustypes of portable pneumatic and: electric drills; thesame being adapted to replace or take. the place; of the ordinary or-so-called pipe-handle: whichv is generally used, and embodying self-contained chain winding means, whereby, through themes dium of said means and the work-embracing chain, constant pressure of the. drill is maintained against the Work to accomplish the drillingop: oration with expediency and reliability.

Novelty is. also predicated upon; a typeof pres: sure handle in which the operator has. complete control of pressure atall times. and omnearin penetration by bit can control thepressuresothat it will cut through the work without the likelihood of a kick-back.

This improved drill handle will; enablethe; user to drill for long periods of timeVwi-thout'fatigllc, will insure constant follow-.up pressureoi-the drill against the work, saves time andjmoney, and is otherwise aptly fitted for the purposesintendedt,

At this point I desire; to; introduce; thegfact that the construction hereinshown,.describedsand claimed is possessed; of improvementsandvrefines ments. not disclosed in a patent. covering- 1a So.- called pressure handle for pneumatic andelcctlric portable drills granted to me. nderzdate ofNO- vember 14, 1944, and identified as 2,,'3,62 ;,929..

Briefly, the invention covered inmy, previous patent comprises a longitudinally elon ated sleeve provided with an internal. bush-ingaand having a longitudinal, slot, at. a predetermined point, a turnable hand-grip;providedwtihafitting telescopically and rotatably fitted. iIIQIlfii-Ghd; pontion of said sleeve, a wormhaving. haftrendsz lo: catedin said sleeve, one shaft-end being:joumalcd in said fitting, means to; maintain the; fittin against longitudinal displacementfromthe sleeve; a casing including a tubular member surrounding said sleeve, said casing also including ageanhousing provided with bearings a. worm gear mounted in said housing and providedgwithpstulr aX QSjQM naled in bearings in said housin isaid worm gear having a peripheral portion thereof projecting through the slot in said sleeve, said worm being in mesh with the teeth on said gear, a cog wheel fixedly mounted on one of the. stub axles; of said worm gear, and a chain cooperable withthetceth of said cog wheel.

A primary purpose of theinst-antinvention is to introduce certain refinements and special d tat ons which. t. is.v e ieize a presenhimprovements over the more complicated and fragile construction covered in the aforementioned pat- 4Claims, (Glyn-1s ent; to say.. I; desire; to; do away with: the bnshingor -leeveii; iii-the. patent. Secondlyltimpizove therunpcn': headconstruction of, the gear casing. orthousing; this being simplified. to provide sockets opening through-oppcsite. ends,. one socket toaccommodate the screw shank of: an adapter piueitha QPnQsitcsocketservingas a. chamber for a. short shatt cnthe hand e the latter bei an integit-ali with the, worm threads; formed thereon instead; of. usingqthe' worm shaft 8 and bearing ollanto the left oisai s aft; as seen. n theprevious-patent-.;

Other features and advantages of the invention willghecomez moreread-ilyapparent fromthe following-descr ption and. thezaccompanying illustrativedrawingst In the; drawings.- wherein. like: numerals are. emplayed to designate like parts; throughout the it-I118? 29 Figure 1 is a side elevational view of the improved ressure;- handle as; designed in accordance, with: the present invention showing the mountedby an: adapter: plate; on one side of-a;conventionalinortabletdrill,

25 Figure -2-:is-;a top-plan. view with the left-hand endsportionbroken away.

figure-dis a view, partly in. section and. partly in elevation, of the completeiattachment, this to bringout; the-coacting relationship. of parts, par- 30 ti ular-ly the;gearing.=

F gures; is afragmentarydetail; section on the short line ..-4\ -4-ofv Figure- 1, partsbeing removed ton clearnessnfi illustration of. this: feature.

Eigure Ezisadace viewpi the adapterplate;

, Figure 6 is a view of theyso-called. exploded type; showinggthe. principal companion parts of the entireassemblv- Eignrefl isa section taken on the-line. of

-10 Referring now to: the: drawings. by distinguishingfircfienence; numerals; attention-L is: firstdirected "11th the-handle; unit:- Ill. This. comprises a. hollow shelter oneepiece 01m providin ahandi-gri the same being; mi1led;-- for efllectivehandling. this 4! formin -the. handrim. Formedintegrally and centrally with .thelleftt-hand; endof. the hand=grip isiaarelatiyely shomistnrdy shafitlichaving'spaced bearings-collars; I33: and I 4;. thepcollar l3.- being ad:- lmentzzthc hand-grin. and ,.both .collars: defining 50 an annular groove or channel; |:5;.for the assemdenoted by the numeral [9. This comprises a single casting having its body portion 20 (see Figure 3) fashioned to house a gear 2| mounted by its hub 21a for rotation on a stub-shaft 22 supported in a suitable bearing in the fixed side side wall 20a of the casing 20 (see Figure 7). The head portion of the casing, indicated at 23, is of general cylindrical form in cross-sectional shape. This is provided at its right-hand end with a bore which serves to accommodate the shaft I 2 and parts embodied therein. This is brought out in Figure 3. That is to say, the bearing collars l3 and I4 fit snugly in the right-hand end portion of the bore and the reduced journal IT is mounted in a centrally apertured partition at one end of the bore, thus providing a satisfactory bearing and assemblage of parts. cision made so that the shaft can be slipped into the bore with ease and expediency. This is a manufacturing as well as a repair-making advantage. It is obvious that the adjacent portion of the chamber which accommodates the gear 21 communicates with a bore so as to permit the worm threads l8 to mesh with the teeth on the gear 2|. It is also to be noted that one end of the stub-shaft 22 extends to the exterior of the casing 20 and this has the chain drum 24 suitably fastened thereon, the chain not being shown. The other end of said shaft 22 terminatesflush with h'ub 2la and both parts unitarily fit into a bearing cup 32 at the center and provided therefor in a removable cover-disk 33 opposed to the wall 20a.

Also, as shown in Figure 3,-a shorter socket is provided'in the left-hand end of the head portion 23 of the unit 19. This is internally threaded to accommodate a screw-threaded shank 25 on the adapter fitting 26. a This fitting has a screwdriver kerf 21 therein to facilitate application and removal. 7

The adapter plug 26 is intended to fit into a socket 28 (see Figure carried by the adapter plate 29. This plate 29 is made to be fastened on a correspondingly shaped and proportioned mount 30 which forms an integral part of the portable drill 3|, Incidentally, it may be mentioned that the structure herein shown is highly adaptable to be used on a heavy-duty electric drill such as that manufactured and sold under the trademark Skilsaw. Picturing the latter type of drill, the usual cast one-piecehandle (not shown here) is removed and the adapter plate 29 is put in place where it fits the stock part 30. Then the drill is ready to receive the improved pressure handle herein covered.

In reducing the invention to-practice, I have evolved and produced a simple and expedient socalled pressure applying handle which is such in construction that one man can, through the use thereof, drill any size hole with ease and in less time than two or three men pushing or pulling, and can, at the same time, steady the drill while drilling holes head-high, overhead, underneath or on a ladder in comparative safety.

It is thought that persons skilled in the art to which the invention relates will be able to obtain a clear understanding of the invention after considering the description in connection with the drawings. Therefore, a more lengthy description is regarded as unnecessary.

Changes in shape, size and arrangement of the details coming within the field of invention claimed may be resorted to in actual practice so Thefeatures are pre- 4 long as they do not depart from the spirit of the invention or scope of the subjoined claims.

I claim:

1. As a component part of a pressure handle of the class described, a pressure regulating and retaining handle adapter plate for connection with a conventional portable drill, said plate being of general rectangular form provided on one face with a central accommodation socket, a screwthreaded fitting coacting with said socket, said fitting being provided with a screw-threaded shank adapted for accommodation of an associated part of said pressure handle.

2. In a structural assemblage of the class described, in combination, an adapter plate of general rectangular form, said adapter plate being adapted to be mounted on an existing stock surface on a portable electric drill, said adapter plate being provided with an internally screwthreaded socket, and a pressure handle attachment, said attachment including at one end a screw-threaded fitting, said fitting being screwed removably into said socket.

3. The structure specified, in claim 2, said pressure handle attachment embodying a gear casing, gearing in said casing, a handle mounted on said casing for operating said gearing, said casing being provided with a screw-threaded socket and said fitting embodying a shank portion threaded into said last-named socket.

4. A pressure regulating and retaining handle for a portable drill comprising a one-piece casting including a substantially circular receptaclelike body portion constituting a gear casing, the latter being closed on one side and provided with a central bearing and open on the opposite side, a removable cover disk for said open side having a bearing cup axially aligned with said bearing, a gear confined and mounted for rotation in said casing and having a hub mounted for rotation in said-bearing cup,-a stub shaft mounted in said hub and having one end terminating in flush relation with a corresponding end of said hub, the other end extending through and beyond said bearing to accommodate a chain drum, said casting further including an integral substantially cylindrical head, the latter having a smooth walled socket opening through one end of the head, -a smaller screw-threaded socket in alignment with said first socket opening through the opposite end of said head, and a partition between said sockets having a bearing hole in alignment with said sockets, and a handle comprising a handgrip formed in one end with an integral axially extending shaft, the outer end of said shaft being reduced and providing a journal, said journal being rotatable in the bearing in said partition, said shaft being provided with an integral worm thread confined in said first-named socket, said socket having an opening in communication with said gear casing, and the threads of said worm being in mesh with the teeth of said gear, and means for removably holding the shaft in said last-named socket.

' J TALIESIN RICHARDS.

REFERENCES CITED UNITED STATES PATENTS Name Date Richards Nov. 14, 1944 Number 

